A delayed Senate report released Wednesday on the 2012 Benghazi attacks argued an FBI investigation has been weakened by the deaths of a number of cooperating Libyan sources.

The Washington Post highlighted the report’s finding that 15 individuals who were “supporting the investigation or otherwise helpful to the United States” have been killed since the attacks. It’s unclear if those killings were in any way related to the U.S. investigation, according to the report.

“The FBI’s investigation into the individuals responsible for the Benghazi attacks has been hampered by inadequate cooperation and a lack of capacity by foreign governments to hold these perpetrators accountable, making the pursuit of justice for the attacks slow and insufficient,” the report read.

The Senate report concluded that the attacks were preventable, faulting the State Department and intelligence agencies for failing to increase security at the diplomatic compound in Benghazi and share information about a secret CIA annex that was also attacked.

ABOUT THE AUTHOR

Catherine Thompson is a senior editor for Talking Points Memo in New York City. She came to the site in 2013 and reported on national affairs. Previously, she worked as a research assistant to investigative reporter Wayne Barrett. She can be reached at catherine@talkingpointsmemo.com.